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Infrastructure-as-a-Service
Clusters

Clusters

The example given here deploys a Kubernetes cluster, but the same logic applies to a SLURM cluster.
You must add your SSH key to your SSH agent before using the terraform CLI.
~/projet-cloud $ eval "$(ssh-agent)"
~/projet-cloud $ ssh-add

Dependencies 

env:
  OS_CLOUD: 'resinfo-discotech@stratuslab.production.virtualdata'
  TF_VAR_VM_PREFIX: 'k3s'
  TF_VAR_IMAGE_NAME: 'jammy-server-cloudimg-amd64.img'
  TF_VAR_SSH_USER: 'ubuntu'
  TF_VAR_FLAVOR_NAME: 'vd.4'
  TF_VAR_PUBLIC_NETWORK: 'public-2'
  TF_VAR_KEYPAIR: 'mykey'
dependencies:
  jq: ^1.7
  yq: ^4.25.2
  terraform.io: ^1.5
  task: ^3.30.1
  openssh.com: ^9.5
  1. The name of the entry in the OpenStack client configuration.
  2. Prefix for all VM names.
  3. Disk image used for VM deployment.
  4. The user login for connecting to the VM.
  5. The VM flavour name (CPU/RAM/DISK).
  6. The name of the network providing public IPs.
  7. The name of the SSH key pair to use.

Tasks 

version: '3'

tasks:

  default:
    silent: true
    cmds:
    - task --list

  deploy:
    desc: deploy
    cmds:
    - |
      bash <<-'EOS'
      source <(pkgx --shellcode)
      terraform apply --auto-approve
      EOS

Activation 

~ $ cd projet-cloud
 ✓  ~/.pkgx/github.com/kkos/oniguruma/v6.9.8
 ✓  ~/.pkgx/stedolan.github.io/jq/v1.7.0
env +stedolan.github.io/jq^1.7 +github.com/mikefarah/yq^4.35.2 +terraform.io^1.5 +taskfile.dev^3.30.1 +gnu.org/coreutils^9.4
~/projet-cloud/ $

Terraform

Variables 

variable VM_PREFIX {
  type = string
}

variable IMAGE_NAME {
  type = string
}

variable SSH_USER {
  type = string
}

variable COMPUTE_COUNT {
  type = number
  default = 3
}

variable FLAVOR_NAME {
  type = string
}

variable PUBLIC_NETWORK {
  type = string
}

variable KEYPAIR {
  type = string
}

Resources 

resource openstack_compute_instance_v2 bootstrap {
  name = "manager-1"
  image_name = var.IMAGE_NAME
  flavor_name = var.FLAVOR_NAME
  key_pair = var.KEYPAIR
  network {
    name = var.PUBLIC_NETWORK
  }
}

resource openstack_compute_instance_v2 compute {
  count = var.COMPUTE_COUNT
  name = "compute-${count.index+1}"
  image_name = var.IMAGE_NAME
  flavor_name = var.FLAVOR_NAME
  key_pair = var.KEYPAIR
  network {
    name = var.PUBLIC_NETWORK
  }
}

Outputs 

output bootstrap_user {
  value = var.SSH_USER
}

output bootstrap_ip {
  value = openstack_compute_instance_v2.bootstrap.access_ip_v4
}

output compute_ip {
  value = openstack_compute_instance_v2.compute.*.access_ip_v4
}

Execution 

~/projet-cloud/ $ task list
~/projet-cloud/ $ task deploy
Load Balancers